Added plink callback.c sshshare.c winsecur.c

1 files changed, 215 insertions, 0 deletions

diff --git a/tools/plink/winsecur.c b/tools/plink/winsecur.c
new file mode 100644
index 000000000..d04e88a92
--- /dev/null
+++ b/tools/plink/winsecur.c
@@ -0,0 +1,215 @@
+/*
+ * winsecur.c: implementation of winsecur.h.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "putty.h"
+
+#if !defined NO_SECURITY
+
+#define WINSECUR_GLOBAL
+#include "winsecur.h"
+
+int got_advapi(void)
+{
+    static int attempted = FALSE;
+    static int successful;
+    static HMODULE advapi;
+
+    if (!attempted) {
+        attempted = TRUE;
+        advapi = load_system32_dll("advapi32.dll");
+        successful = advapi &&
+            GET_WINDOWS_FUNCTION(advapi, GetSecurityInfo) &&
+            GET_WINDOWS_FUNCTION(advapi, OpenProcessToken) &&
+            GET_WINDOWS_FUNCTION(advapi, GetTokenInformation) &&
+            GET_WINDOWS_FUNCTION(advapi, InitializeSecurityDescriptor) &&
+            GET_WINDOWS_FUNCTION(advapi, SetSecurityDescriptorOwner) &&
+            GET_WINDOWS_FUNCTION(advapi, SetEntriesInAclA);
+    }
+    return successful;
+}
+
+int got_crypt(void)
+{
+    static int attempted = FALSE;
+    static int successful;
+    static HMODULE crypt;
+
+    if (!attempted) {
+        attempted = TRUE;
+        crypt = load_system32_dll("crypt32.dll");
+        successful = crypt &&
+            GET_WINDOWS_FUNCTION(crypt, CryptProtectMemory);
+    }
+    return successful;
+}
+
+PSID get_user_sid(void)
+{
+    HANDLE proc = NULL, tok = NULL;
+    TOKEN_USER *user = NULL;
+    DWORD toklen, sidlen;
+    PSID sid = NULL, ret = NULL;
+
+    if (!got_advapi())
+        goto cleanup;
+
+    if ((proc = OpenProcess(MAXIMUM_ALLOWED, FALSE,
+                            GetCurrentProcessId())) == NULL)
+        goto cleanup;
+
+    if (!p_OpenProcessToken(proc, TOKEN_QUERY, &tok))
+        goto cleanup;
+
+    if (!p_GetTokenInformation(tok, TokenUser, NULL, 0, &toklen) &&
+        GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+        goto cleanup;
+
+    if ((user = (TOKEN_USER *)LocalAlloc(LPTR, toklen)) == NULL)
+        goto cleanup;
+
+    if (!p_GetTokenInformation(tok, TokenUser, user, toklen, &toklen))
+        goto cleanup;
+
+    sidlen = GetLengthSid(user->User.Sid);
+
+    sid = (PSID)smalloc(sidlen);
+
+    if (!CopySid(sidlen, sid, user->User.Sid))
+        goto cleanup;
+
+    /* Success. Move sid into the return value slot, and null it out
+     * to stop the cleanup code freeing it. */
+    ret = sid;
+    sid = NULL;
+
+  cleanup:
+    if (proc != NULL)
+        CloseHandle(proc);
+    if (tok != NULL)
+        CloseHandle(tok);
+    if (user != NULL)
+        LocalFree(user);
+    if (sid != NULL)
+        sfree(sid);
+
+    return ret;
+}
+
+int make_private_security_descriptor(DWORD permissions,
+                                     PSECURITY_DESCRIPTOR *psd,
+                                     PACL *acl,
+                                     char **error)
+{
+    SID_IDENTIFIER_AUTHORITY world_auth = SECURITY_WORLD_SID_AUTHORITY;
+    SID_IDENTIFIER_AUTHORITY nt_auth = SECURITY_NT_AUTHORITY;
+    EXPLICIT_ACCESS ea[3];
+    int acl_err;
+    int ret = FALSE;
+
+    /* Initialised once, then kept around to reuse forever */
+    static PSID worldsid, networksid, usersid;
+
+    *psd = NULL;
+    *acl = NULL;
+    *error = NULL;
+
+    if (!got_advapi()) {
+        *error = dupprintf("unable to load advapi32.dll");
+        goto cleanup;
+    }
+
+    if (!usersid) {
+        if ((usersid = get_user_sid()) == NULL) {
+            *error = dupprintf("unable to construct SID for current user: %s",
+                               win_strerror(GetLastError()));
+            goto cleanup;
+        }
+    }
+
+    if (!worldsid) {
+        if (!AllocateAndInitializeSid(&world_auth, 1, SECURITY_WORLD_RID,
+                                      0, 0, 0, 0, 0, 0, 0, &worldsid)) {
+            *error = dupprintf("unable to construct SID for world: %s",
+                               win_strerror(GetLastError()));
+            goto cleanup;
+        }
+    }
+
+    if (!networksid) {
+        if (!AllocateAndInitializeSid(&nt_auth, 1, SECURITY_NETWORK_RID,
+                                      0, 0, 0, 0, 0, 0, 0, &networksid)) {
+            *error = dupprintf("unable to construct SID for "
+                               "local same-user access only: %s",
+                               win_strerror(GetLastError()));
+            goto cleanup;
+        }
+    }
+
+    memset(ea, 0, sizeof(ea));
+    ea[0].grfAccessPermissions = permissions;
+    ea[0].grfAccessMode = REVOKE_ACCESS;
+    ea[0].grfInheritance = NO_INHERITANCE;
+    ea[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    ea[0].Trustee.ptstrName = (LPTSTR)worldsid;
+    ea[1].grfAccessPermissions = permissions;
+    ea[1].grfAccessMode = GRANT_ACCESS;
+    ea[1].grfInheritance = NO_INHERITANCE;
+    ea[1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    ea[1].Trustee.ptstrName = (LPTSTR)usersid;
+    ea[2].grfAccessPermissions = permissions;
+    ea[2].grfAccessMode = REVOKE_ACCESS;
+    ea[2].grfInheritance = NO_INHERITANCE;
+    ea[2].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    ea[2].Trustee.ptstrName = (LPTSTR)networksid;
+
+    acl_err = p_SetEntriesInAclA(3, ea, NULL, acl);
+    if (acl_err != ERROR_SUCCESS || *acl == NULL) {
+        *error = dupprintf("unable to construct ACL: %s",
+                           win_strerror(acl_err));
+        goto cleanup;
+    }
+
+    *psd = (PSECURITY_DESCRIPTOR)
+        LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
+    if (!*psd) {
+        *error = dupprintf("unable to allocate security descriptor: %s",
+                           win_strerror(GetLastError()));
+        goto cleanup;
+    }
+
+    if (!InitializeSecurityDescriptor(*psd, SECURITY_DESCRIPTOR_REVISION)) {
+        *error = dupprintf("unable to initialise security descriptor: %s",
+                           win_strerror(GetLastError()));
+        goto cleanup;
+    }
+
+    if (!SetSecurityDescriptorDacl(*psd, TRUE, *acl, FALSE)) {
+        *error = dupprintf("unable to set DACL in security descriptor: %s",
+                           win_strerror(GetLastError()));
+        goto cleanup;
+    }
+
+    ret = TRUE;
+
+  cleanup:
+    if (!ret) {
+        if (*psd) {
+            LocalFree(*psd);
+            *psd = NULL;
+        }
+        if (*acl) {
+            LocalFree(*acl);
+            *acl = NULL;
+        }
+    } else {
+        sfree(*error);
+        *error = NULL;
+    }
+    return ret;
+}
+
+#endif /* !defined NO_SECURITY */